Optical imaging system

ABSTRACT

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially disposed in ascending numerical order along an optical axis from an object side of the optical imaging system toward an imaging plane of an image sensor, wherein TTL/(2*IMG HT)≤0.67 is satisfied, where TTL is a distance along the optical axis from an object-side surface of the first lens to the imaging plane of the image sensor, and IMG HT is one half of a diagonal length of the imaging plane of the image sensor, and 15&lt;v1-v3&lt;45 is satisfied, where v1 is an Abbe number of the first lens, and v3 is an Abbe number of the third lens.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit under 35 USC 119(a) of Korean PatentApplication No. 10-2020-0068432 filed on Jun. 5, 2020, in the KoreanIntellectual Property Office, the entire disclosure of which isincorporated herein by reference for all purposes.

BACKGROUND 1. Field

This application relates to an optical imaging system.

1. Description of Related Art

A portable terminal device has been designed to include a cameraincluding an optical imaging system including a plurality of lenses toallow video calls to be performed and to take images and videos of anobject.

As functions of a camera have been increased in a portable terminaldevice, there has been an increasing demand for a camera used in aportable terminal device to have a high resolution.

As a portable terminal device has been designed to have a reduced size,it has been necessary for a camera used in a portable terminal device tohave a reduced size.

Thus, there has been a need to develop an optical imaging system havinga reduced size and a high resolution.

SUMMARY

This Summary is provided to introduce a selection of concepts insimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used as an aid in determining the scope of the claimed subjectmatter.

In one general aspect, an optical imaging system includes a first lens,a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens,and a seventh lens sequentially disposed in ascending numerical orderalong an optical axis from an object side of the optical imaging systemtoward an imaging plane of an image sensor, wherein TTL/(2*IMG HT)≤0.67is satisfied, where TTL is a distance along the optical axis from anobject-side surface of the first lens to the imaging plane of the imagesensor, and IMG HT is one half of a diagonal length of the imaging planeof the image sensor, and 15<v1-v3<45 is satisfied, where v1 is an Abbenumber of the first lens, and v3 is an Abbe number of the third lens.

Any one or any combination of any two or more of 25<v1-v2<45,25<v1-v4<45, and 15<v1-v5<45 may be satisfied, where v2 is an Abbenumber of the second lens, v4 is an Abbe number of the fourth lens, andv5 is an Abbe number of the fifth lens.

Fno<2.0 may be satisfied, where Fno is an f-number of the opticalimaging system.

0<f1/f<2 may be satisfied, where f1 is a focal length of the first lens,and f is a focal length of the optical imaging system.

−3.5<f2/f<0 may be satisfied, where f2 is a focal length of the secondlens, and f is a focal length of the optical imaging system.

3/f>1.5 may be satisfied, where f3 is a focal length of the third lens,and f is a focal length of the optical imaging system.

−9<f4/f<0 may be satisfied, where f4 is a focal length of the fourthlens, and f is a focal length of the optical imaging system.

−30<f5/f<20 may be satisfied, where f5 is a focal length of the fifthlens, and f is a focal length of the optical imaging system.

TTL/f<1.4 may be satisfied, where f is a focal length of the opticalimaging system, and BFL/f<0.4 may be satisfied, where BFL is a distancealong the optical axis from an image-side surface of the seventh lens tothe imaging plane of the image sensor.

−1<f1/f2<0 may be satisfied, where f1 is a focal length of the firstlens, and f2 is a focal length of the second lens.

−2<f2/f3<0 may be satisfied, where f2 is a focal length of the secondlens, and f3 is a focal length of the third lens.

D1/f<0.3 may be satisfied, where D1 is a distance along the optical axisfrom an image-side surface of the first lens to an object-side surfaceof the second lens, and f is a focal length of the optical imagingsystem.

0.4<SD5/IMG HT<0.7 may be satisfied, where SD5 is an effective apertureradius of an image-side surface of the fifth lens.

0.6<SD6/IMG HT<0.8 may be satisfied, where SD6 is an effective apertureradius of an image-side surface of the sixth lens.

0.7<SD7/IMG HT<1 may be satisfied, where SD7 is an effective apertureradius of an image-side surface of the seventh lens.

−5<f2/f6<0 may be satisfied, where f2 is a focal length of the secondlens, and f6 is a focal length of the sixth lens.

0<f2/f7<5 may be satisfied, where f2 is a focal length of the secondlens, and f7 is a focal length of the seventh lens.

0<f6/f<2 may be satisfied, where f6 is a focal length of the sixth lens,and f is a focal length of the optical imaging system.

−2<f7/f<0 may be satisfied, where f7 is a focal length of the seventhlens, and f is a focal length of the optical imaging system.

74°<FOV<90° may be satisfied, where FOV is a field of view of theoptical imaging system.

1<f12/f<2 may be satisfied, where f12 is a combined focal length of thefirst lens and the second lens, and f is a focal length of the opticalimaging system.

The first lens may have a positive refractive power, the second lens mayhave a negative refractive power, the third lens may have a positiverefractive power, the fourth lens may have a negative refractive power,the fifth lens may have a negative refractive power, the sixth lens mayhave a positive refractive power, and the seventh lens may have anegative refractive power.

In another general aspect, an optical imaging system includes a firstlens, a second lens, a third lens, a fourth lens, a fifth lens, a sixthlens, and a seventh lens sequentially disposed in ascending numericalorder along an optical axis from an object side of the optical imagingsystem toward an imaging plane of an image sensor, wherein 15<v1-v3<45is satisfied, where v1 is an Abbe number of the first lens, and v3 is anAbbe number of the third lens.

All of 25<v1-v2<45, 25<v1-v4<45, and 15<v1-v5<45 may be satisfied, wherev2 is an Abbe number of the second lens, v4 is an Abbe number of thefourth lens, and v5 is an Abbe number of the fifth lens.

The first lens may have a positive refractive power, the second lens mayhave a negative refractive power, the third lens may have a positiverefractive power, the fourth lens may have a negative refractive power,the fifth lens may have a negative refractive power, the sixth lens mayhave a positive refractive power, and the seventh lens may have anegative refractive power.

The first lens may have a convex object-side surface and a concaveimage-side surface, the second lens may have a convex object-sidesurface and a concave image-side surface, the fourth lens may have aconvex object-side surface and a concave image-side surface, the fifthlens may have a convex object-side surface and a concave image-sidesurface, the sixth lens may have a convex object-side surface and aconcave image-side surface, and the seventh lens may have a concaveimage-side surface.

Other features and aspects will be apparent from the following detaileddescription, the drawings, and the claims.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a first example of an optical imagingsystem.

FIG. 2 is a diagram illustrating aberration properties of the opticalimaging system illustrated in FIG. 1.

FIG. 3 is a diagram illustrating a second example of an optical imagingsystem.

FIG. 4 is a diagram illustrating aberration properties of the opticalimaging system illustrated in FIG. 3.

FIG. 5 is a diagram illustrating a third example of an optical imagingsystem.

FIG. 6 is a diagram illustrating aberration properties of the opticalimaging system illustrated in FIG. 5.

FIG. 7 is a diagram illustrating a fourth example of an optical imagingsystem.

FIG. 8 is a diagram illustrating aberration properties of the opticalimaging system illustrated in FIG. 7.

FIG. 9 is a diagram illustrating a fifth example of an optical imagingsystem.

FIG. 10 is a diagram illustrating aberration properties of the opticalimaging system illustrated in FIG. 9.

Throughout the drawings and the detailed description, the same referencenumerals refer to the same elements. The drawings may not be to scale,and the relative size, proportions, and depiction of elements in thedrawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

The following detailed description is provided to assist the reader ingaining a comprehensive understanding of the methods, apparatuses,and/or systems described herein. However, various changes,modifications, and equivalents of the methods, apparatuses, and/orsystems described herein will be apparent after an understanding of thedisclosure of this application. For example, the sequences of operationsdescribed herein are merely examples, and are not limited to those setforth herein, but may be changed as will be apparent after anunderstanding of the disclosure of this application, with the exceptionof operations necessarily occurring in a certain order. Also,descriptions of functions and constructions that are known in the artmay be omitted for increased clarity and conciseness.

The features described herein may be embodied in different forms, andare not to be construed as being limited to the examples describedherein. Rather, the examples described herein have been provided merelyto illustrate some of the many possible ways of implementing themethods, apparatuses, and/or systems described herein that will beapparent after an understanding of the disclosure of this application.

Use herein of the term “may” with respect to an example or embodiment,e.g., as to what an example or embodiment may include or implement,means that at least one example or embodiment exists in which such afeature is included or implemented while all examples and embodimentsare not limited thereto.

Throughout the specification, when an element, such as a layer, region,or substrate, is described as being “on,” “connected to,” or “coupledto” another element, it may be directly “on,” “connected to,” or“coupled to” the other element, or there may be one or more otherelements intervening therebetween. In contrast, when an element isdescribed as being “directly on,” “directly connected to,” or “directlycoupled to” another element, there can be no other elements interveningtherebetween.

As used herein, the term “and/or” includes any one and any combinationof any two or more of the associated listed items.

Although terms such as “first,” “second,” and “third” may be used hereinto describe various elements, these elements are not to be limited bythese terms. Rather, these terms are only used to distinguish oneelement from another element. Thus, a first element referred to inexamples described herein may also be referred to as a second elementwithout departing from the teachings of the examples.

Spatially relative terms such as “above,” “upper,” “below,” and “lower”may be used herein for ease of description to describe one element'srelationship to another element as illustrated in the figures. Suchspatially relative terms are intended to encompass differentorientations of the device in use or operation in addition to theorientation depicted in the figures. For example, if the device in thefigures is turned over, an element described as being “above” or “upper”relative to another element will then be “below” or “lower” relative tothe other element. Thus, the term “above” encompasses both the above andbelow orientations depending on the spatial orientation of the device.The device may also be oriented in other ways (for example, rotated by90 degrees or at other orientations), and the spatially relative termsused herein are to be interpreted accordingly.

The terminology used herein is for describing various examples only, andis not to be used to limit the disclosure. The articles “a,” “an,” and“the” are intended to include the plural forms as well, unless thecontext clearly indicates otherwise. The terms “comprises,” “includes,”and “has” specify the presence of stated features, numbers, operations,members, elements, and/or combinations thereof, but do not exclude thepresence or addition of one or more other features, numbers, operations,members, elements, and/or combinations thereof.

The features of the examples described herein may be combined in variousways as will be apparent after an understanding of the disclosure ofthis application. Furthermore, although the examples described hereinhave a variety of configurations, other configurations are possible aswill be apparent after an understanding of the disclosure of thisapplication.

Due to manufacturing techniques and/or tolerances, variations of theshapes illustrated in the drawings may occur. Thus, the examplesdescribed herein are not limited to the specific shapes illustrated inthe drawings, but include changes in shape that occur duringmanufacturing.

In the drawings, the thicknesses, sizes, and shapes of the lenses may beexaggerated for clarity and ease of illustration. The shapes of thespherical or aspherical surfaces of the lenses in the drawings aremerely examples, and the spherical or aspherical surfaces are notlimited to these shapes.

An optical imaging system according to this application may includeseven lenses.

For example, the optical imaging system may include a first lens, asecond lens, a third lens, a fourth lens, a fifth lens, a sixth lens,and a seventh lens sequentially disposed in ascending numerical orderalong an optical axis from an object side of the optical imaging systemtoward an imaging plane of the optical imaging system. The first toseventh lenses may be spaced apart from each other by predetermineddistances along the optical axis.

Thus, the first lens is a lens closest to an object side of the opticalimaging system, and the seventh lens is a lens closest to the imagingplane of the optical imaging system.

In each lens, a first surface or an object-side surface is a surfaceclosest to the object side of the optical imaging system, and a secondsurface or an image-side surface is a surface closest to the imagingplane of the optical imaging system.

Radiuses of curvature of lens surfaces, thickness of the lenses andother elements, distances between the lenses and the other elements,focal lengths, TTL, BFL, IMG HT, SD5, SD6, and SD7 are expressed inmillimeters (mm), FOV is expressed in degrees)(°, and Fno, refractiveindexes, and Abbe numbers are dimensionless quantities. The namedquantities are defined later in this application.

The thicknesses of the lenses and the other elements, the distancesbetween the lenses and the other elements, TTL, and BFL are measuredalong the optical axis of the optical imaging system.

Unless stated otherwise, a reference to the shape of a lens surfacemeans a shape of a paraxial region of the lens surface. A paraxialregion of a lens surface is a central portion of the lens surfacesurrounding an optical axis of the lens surface in which light raysincident to the lens surface make a small angle θ to the optical axis,and the approximations sin θ≈θ, tan θ≈θ, and cos θ≈1 are valid.

For example, a statement that a surface of a lens is convex, concave, orplanar means that at least a paraxial region of the surface of the lensis convex, concave, or planar. Therefore, even though a surface of alens may be described as being convex, a peripheral region of thesurface of the lens may be concave or planar. Also, even though asurface of a lens may be described as being concave, a peripheral regionof the surface of the lens may be convex or planar. Also, even though asurface of a lens may be described as being planar, a peripheral regionof the surface of the lens may be convex or concave.

As described above, an optical imaging system according to hisapplication may include first to seventh lenses. However, the opticalimaging system is not limited to only the seven lenses, but may furtherinclude other elements if desired.

For example, the optical imaging system may further include an imagesensor for converting an image of an object incident onto an imagingplane of the image sensor into an electrical signal.

Also, the optical imaging system may further include an infrared filterhereinafter referred to merely as a filter) for blocking infrared rays.The filter may be disposed between the seventh lens and the imagesensor.

Also, the optical imaging system may further include a stop foradjusting an amount of light that is incident onto the imaging plane ofthe image sensor.

The first to seventh lenses may be made of a plastic material.

Also, at least one of the first to seventh lenses may have an asphericalsurface. For example, each of the first to seventh lenses may have atleast one aspherical surface.

In other words, at least one of a first surface and a second surface ofeach of the first to seventh lenses may be aspherical. Each asphericalsurface of the first to seventh lenses is defined by Equation 1 below.

$\begin{matrix}{Z = {\frac{{cY}^{2}}{1 + \sqrt{1 - {( {1 + K} )c^{2}Y^{2}}}} + {AY^{4}} + {B\; Y^{6}} + {CY}^{8} + {DY}^{10} + {EY}^{12} + {FY^{14}} + {GY}^{16} + {HY}^{18} + {JY}^{20}}} & (1)\end{matrix}$

In Equation 1, c is a curvature of a lens surface and is equal to areciprocal of a radius of curvature of the lens surface at an opticalaxis of the lens surface, K is a conic constant, Y is a distance fromany point on the lens surface to the optical axis of the lens surface ina direction perpendicular to the optical axis of the lens surface, A toH and J are aspheric constants, and Z (also known as sag) is a distancein a direction parallel to the optical axis of the lens surface from thepoint on the lens surface at the distance Y from the optical axis of thelens surface to a tangential plane perpendicular to the optical axis andintersecting a vertex of the lens surface.

The first to seventh lenses may have a positive refractive power, anegative refractive power, a positive refractive power, a negativerefractive power, a negative refractive power, a positive refractivepower, and a negative refractive power, respectively.

The optical imaging system may satisfy any one or any combination of anytwo or more of Conditional Expressions 1 to 25 below:

0<f1/f<2  (Conditional Expression 1)

25<v1−v2<45  (Conditional Expression 2)

15<v1−v3<45  (Conditional Expression 3)

25<v1−v4<45  (Conditional Expression 4)

15<v1−v5<45  (Conditional Expression 5)

−3.5<f2/f<0  (Conditional Expression 6)

f3/f>1.5  (Conditional Expression 7)

−9<f4/f<0  (Conditional Expression 8)

−30<f5/f<20  (Conditional Expression 9)

0<f6/f<2  (Conditional Expression 10)

−2<f7/f<0  (Conditional Expression 11)

TTL/f<1.4  (Conditional Expression 12)

−1<f1/f2<0  (Conditional Expression 13)

−2<f2/f3<0  (Conditional Expression 14)

BFL/f<0.4  (Conditional Expression 15)

D1/f<0.3  (Conditional Expression 16)

0.4<SD5/IMG HT<0.7  (Conditional Expression 17)

0.6<SD6/IMG HT<0.8  (Conditional Expression 18)

0.7<SD7/IMG HT<1  (Conditional Expression 19)

0<f2/f7<5  (Conditional Expression 20)

−5<f2/f6<0  (Conditional Expression 21)

74°<FOV<90°  (Conditional Expression 22)

Fno<2.0  (Conditional Expression 23)

TTL/(2*IMG HT)≤0.67  (Conditional Expression 24)

1<f12/f<2  (Conditional Expression 25)

In Conditional Expressions 1 to 25, f is a focal length of the opticalimaging system, f1 is a focal length of the first lens, f2 is a focallength of the second lens, f3 is a focal length of the third lens, f4 isa focal length of the fourth lens, f5 is a focal length of the fifthlens, f6 is a focal length of the sixth lens, f7 is a focal length ofthe seventh lens, and f12 is a combined focal length of the first lensand the second lens.

v1 is an Abbe number of the first lens, v2 is an Abbe number of thesecond lens, v3 is an Abbe number of the third lens, v4 is an Abbenumber of the fourth lens, and v5 is an Abbe number of the fifth lens.

TTL is a distance along the optical axis from an object-side surface ofthe first lens to the imaging plane of the image sensor, BFL is adistance along the optical axis from an image-side surface of theseventh lens to the imaging plane of the image sensor, D1 is a distancealong the optical axis between an image-side surface of the first lensand an object-side surface of the second lens, and IMG HT is one half ofa diagonal length of the imaging plane of the image sensor.

FOV is a field of view of the optical imaging system, and Fno is anf-number of the optical imaging system, which is equal to the focallength f of the optical imaging system divided by an entrance pupildiameter of the optical imaging system and is indicative of a brightnessof the optical imaging system.

SD5 is an effective aperture radius of an image-side surface of thefifth lens, SD6 is an effective aperture radius of an image-side surfaceof the sixth lens, and SD7 is an effective aperture radius of theimage-side surface of the seventh lens.

An effective aperture radius of a lens surface is a radius of a portionof the lens surface through which light actually passes, and is notnecessarily a radius of an outer edge of the lens surface. Anobject-side surface of a lens and an image-side surface of the lens mayhave different effective aperture radiuses.

Stated another way, an effective aperture radius of a lens surface is adistance in a direction perpendicular to an optical axis of the lenssurface between the optical axis of the lens surface and a marginal rayof light passing through the lens surface.

The first lens may have a positive refractive power. Also, the firstlens may have a meniscus shape convex toward the object side of theoptical imaging system. In other words, a first surface of the firstlens may be convex, and a second surface of the first lens may beconcave.

At least one of the first surface and the second surface of the firstlens may be aspherical. For example, both surfaces of the first lens maybe aspherical.

The second lens may have a negative refractive power. Also, the secondlens may have a meniscus shape convex toward the object side of theoptical imaging system. In other words, the first surface of the secondlens may be convex, and the second surface of the second lens may beconcave.

At least one of the first surface and the second surface of the secondlens may be aspherical. For example, both surfaces of the second lensmay be aspherical.

The third lens may have a positive refractive power. Also, the thirdlens may have a meniscus shape convex toward the image side of theoptical imaging system. In other words, the first surface of the thirdlens may be concave, and the second surface of the third lens may beconvex.

Alternatively, both surfaces of the third lens may be convex. In otherwords, the first and second surfaces of the third lens may be convex.

Alternatively, the third lens may have a meniscus shape convex towardthe object side of the optical imaging system. In other words, the firstsurface of the third lens may be convex, and the second surface of thethird lens may be concave.

At least one of the first surface and the second surface of the thirdlens may be aspherical. For example, both surfaces of the third lens maybe aspherical.

The fourth lens may have a negative refractive power. Also, the fourthlens may have a meniscus shape convex toward the object side of theoptical imaging system. In other words, the first surface of the fourthlens may be convex, and the second surface of the third lens may beconcave.

At least one of the first surface and the second surface of the fourthlens may be aspherical. For example, both surfaces of the fourth lensmay be aspherical.

The fifth lens may have a negative refractive power. Also, the fifthlens may have a meniscus shape convex toward the object side of theoptical imaging system. In other words, the first surface of the fifthlens may be convex in a paraxial region, and the second surface of thefifth lens may be concave in a paraxial region.

At least one of the first surface and the second surface of the fifthlens may be aspherical. For example, both surfaces of the fifth lens maybe aspherical.

The fifth lens may have at least one inflection point formed on at leastone of the first surface and the second surface. For example, the firstsurface of the fifth lens may be convex in a paraxial region and may beconcave in portions other than a paraxial region. The second surface ofthe fifth lens may be concave in a paraxial region, and may be convex inportions other than a paraxial region.

The sixth lens may have a positive refractive power. Also, the sixthlens may have a meniscus shape convex toward the object side of theoptical imaging system. In other words, the first surface of the sixthlens may be convex in a paraxial region, and the second surface may beconcave in a paraxial region.

At least one of the first surface and the second surface of the sixthlens may be aspherical. For example, both surfaces of the sixth lens maybe aspherical.

The sixth lens may have at least one inflection point formed on at leastone of the first surface and the second surface. For example, the firstsurface of the sixth lens may be convex in a paraxial region and may beconcave in portions other than a paraxial region. The second surface ofthe sixth lens may be concave in a paraxial region and may be convex inportions other than a paraxial region

The seventh lens may have a negative refractive power. Also, the seventhlens may have a meniscus shape convex toward the object side of theoptical imaging system. In other words, the first surface of the seventhlens may be convex in a paraxial region, and the second surface may beconcave in a paraxial region.

Alternatively, both surfaces of the seventh lens may be concave. Inother words, the first surface and the second surface of the seventhlens may be concave in a paraxial region.

At least one of the first surface and the second surface of the seventhlens may be aspherical. For example, both surfaces of the seventh lensmay be aspherical.

At least one inflection point may be formed on at least one of the firstsurface and the second surface of the seventh lens. For example, thefirst surface of the seventh lens may be convex in a paraxial region andmay be concave in portions other than a paraxial region. The secondsurface of the seventh lens may be concave in a paraxial region and maybe convex in portions other than a paraxial region.

The first lens and the second lens may be made of plastic materialshaving different optical properties, and the second lens and the thirdlens may be made of plastic materials having different opticalproperties. Also, the first to third lenses may be made of plasticmaterials having different optical properties.

At least two of the first to seventh lenses may have a refractive indexgreater than 1.66.

Among the first to fourth lenses, a lens having a negative refractivepower may have a refractive index greater than 1.66. For example, thesecond lens and the fourth lens may have a negative refractive power andmay have a refractive index greater than 1.66.

FIG. 1 is a diagram illustrating a first example of an optical imagingsystem, and FIG. 2 is a diagram illustrating aberration properties ofthe optical imaging system illustrated in FIG. 1.

The optical imaging system of the first example may include an opticalsystem including a first lens 110, a second lens 120, a third lens 130,a fourth lens 140, a fifth lens 150, a sixth lens 160, and a seventhlens 170, and may further include a stop (not shown), a filter 180, andan image sensor 190.

Optical characteristics of each element (a radius of curvature of eachsurface of the element, a thickness of the element or a distance betweenthe element and a next element, a refractive index, an Abbe number, anda focal length) of the optical imaging system are listed in Table 1below.

TABLE 1 Surface Radius of Thickness or Refractive Abbe Focal No. ElementCurvature Distance Index Number Length S1 First Lens 2.28041 0.9385871.5462 55.96 5.28811 S2 9.25794 0.0462435 S3 Second Lens 6.715240.273305 1.6769 19.24 −14.4561 S4 3.91701 0.463051 S5 Third Lens−36.8655 0.365451 1.5704 37.36 45.098 S6 −15.2053 0.208521 S7 FourthLens 274.567 0.292760 1.6769 19.24 −32.2585 S8 20.2197 0.532776 S9 FifthLens 13.5185 0.431686 1.5704 37.36 −58.1441 S10 9.49223 0.394963 S11Sixth Lens 2.79911 0.803752 1.5366 55.69 5.88235 S12 22.2452 0.648331S13 Seventh Lens 10.4071 0.5 1.5366 55.69 −4.60759 S14 1.96429 0.321401S15 Filter Infinity 0.21 1.5183 64.20 S16 Infinity 0.5697843 S17 ImagingPlane Infinity

A focal length f of the optical imaging system of the first example is5.74564 mm, f12 is 7.3574 mm, Fno is 1.75, FOV is 83°, IMG HT is 5.272mm, SD5 is 2.51 mm, SD6 is 3.804 mm, and SD7 is 4.4013 mm.

f12 is a combined focal length of the first lens and the second lens,Fno is f-number of the optical imaging system, which is equal to thefocal length f of the optical imaging system divided by an entrancepupil diameter of the optical imaging system and is indicative of abrightness of the optical imaging system, FOV is a field of view of theoptical imaging system, IMG HT is one half of a diagonal length of theimaging plane of the image sensor, SD5 is an effective aperture radiusof the image-side surface of the fifth lens, SD6 is an effectiveaperture radius of the image-side surface of the sixth lens, and SD7 isan effective aperture radius of the image-side surface of the seventhlens.

In the first example, the first lens 110 may have a positive refractivepower, the first surface of the first lens 110 may be convex, and thesecond surface of the first lens 110 may be concave.

The second lens 120 may have a negative refractive power, the firstsurface of the second lens 120 may be convex, and the second surface ofthe second lens 120 may be concave.

The third lens 130 may have a positive refractive power, the firstsurface of the third lens 130 may be concave, and the second surface ofthe third lens 130 may be convex.

The fourth lens 140 may have a negative refractive power, the firstsurface of the fourth lens 140 may be convex, and the second surface ofthe fourth lens 140 may be concave.

The fifth lens 150 may have a negative refractive power, the firstsurface of the fifth lens 150 may be convex in a paraxial region, andthe second surface of the fifth lens 150 may be concave in a paraxialregion.

Also, at least one inflection point may be formed on at least one of thefirst and second surfaces of the fifth lens 150. For example, the firstsurface of the fifth lens 150 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. Further, the secondsurface of the fifth lens 150 may be concave in a paraxial region andmay be convex in portions other than a paraxial region.

The sixth lens 160 may have a positive refractive power, the firstsurface of the sixth lens 160 may be convex in a paraxial region, andthe second surface of the sixth lens 160 may be concave in a paraxialregion.

At least one inflection point may be formed on at least one of the firstand second surfaces of the sixth lens 160. For example, the firstsurface of the sixth lens 160 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. Further, the secondsurface of the sixth lens 160 may be concave in a paraxial region andmay be convex in portions other than a paraxial region.

The seventh lens 170 may have a negative refractive power, the firstsurface of the seventh lens 170 may be convex in a paraxial region, andthe second surface of the seventh lens 170 may be concave in a paraxialregion.

At least one inflection point may be formed on at least one of the firstand second surfaces of the seventh lens 170. For example, the firstsurface of the seventh lens 170 may be convex in a paraxial region andmay be concave in portions other than a paraxial region. Further, thesecond surface of the seventh lens 170 may be concave in a paraxialregion and may be convex in portions other than a paraxial region.

Each surface of the first lens 110 to the seventh lens 170 has theaspherical coefficients listed in Table 2 below. In this example, boththe first surface and the second surface of each of the first lens 110to the seventh lens 170 are aspherical.

TABLE 2 S1 S2 S3 S4 S5 S6 S7 Conic −0.959 22.248 17.232 3.145 95.00090.861 −95.000 Constant (K) Fourth −0.039 −0.082 −0.033 −0.034 0.015−0.016 −0.076 Coefficient (A) Sixth 0.364 0.507 −0.057 0.197 −0.430−0.107 0.157 Coefficient (B) Eighth −1.522 −2.380 0.729 −0.782 3.2410.749 −0.948 Coefficient (C) Tenth 4.057 7.396 −3.322 1.037 −15.137−3.200 3.759 Coefficient (D) Twelfth −7.310 −15.603 9.246 4.324 46.5768.912 −10.162 Coefficient (E) Fourteenth 9.258 23.116 −17.242 −24.782−98.781 −17.115 19.152 Coefficient (F) Sixteenth −8.434 −24.609 22.43960.923 148.494 23.412 −25.672 Coefficient (G) Eighteenth 5.593 19.044−20.805 −92.199 −160.566 −23.182 24.758 Coefficient (H) Twentieth −2.701−10.724 13.831 93.358 125.266 16.667 −17.209 Coefficient (J) S8 S9 S10S11 S12 S13 S14 Conic 93.313 6.992 −94.848 −5.318 23.563 −95.000 −7.361Constant (K) Fourth −0.050 −0.080 −0.117 −0.016 0.037 −0.113 −0.057Coefficient (A) Sixth −0.032 0.089 0.084 0.009 −0.005 0.058 0.023Coefficient (B) Eighth 0.207 −0.112 −0.068 −0.012 −0.011 −0.024 −0.008Coefficient (C) Tenth −0.597 0.133 0.055 0.008 0.009 0.008 0.002Coefficient (D) Twelfth 1.049 −0.123 −0.035 −0.003 −0.004 −0.002 0.000Coefficient (E) Fourteenth −1.233 0.083 0.016 0.001 0.001 0.000 0.000Coefficient (F) Sixteenth 1.006 −0.041 −0.006 0.000 0.000 0.000 0.000Coefficient (G) Eighteenth −0.576 0.015 0.001 0.000 0.000 0.000 0.000Coefficient (H) Twentieth 0.230 −0.004 0.000 0.000 0.000 0.000 0.000Coefficient (J)

The optical imaging system having the configuration described above hasthe aberration properties illustrated in FIG. 2.

FIG. 3 is a diagram illustrating a second example of an optical imagingsystem, and FIG. 4 is a diagram illustrating aberration properties ofthe optical imaging system illustrated in FIG. 3.

The optical imaging system of the second example may include an opticalsystem including a first lens 210, a second lens 220, a third lens 230,a fourth lens 240, a fifth lens 250, a sixth lens 260, and a seventhlens 270, and may further include a stop (not shown), a filter 280, andan image sensor 290.

Optical characteristics of each element (a radius of curvature of eachsurface of the element, a thickness of the element or a distance betweenthe element and a next element, a refractive index, an Abbe number, anda focal length) of the optical imaging system are listed in Table 3below.

TABLE 3 Surface Radius of Thickness or Refractive Abbe Focal No. ElementCurvature Distance Index Number Length S1 First Lens 2.29427 1.0231.5459 56.11 5.29301 S2 9.38213 0.0628204 S3 Second Lens 6.86138 0.261.6776 19.25 −13.5289 S4 3.86409 0.385873 S5 Third Lens 36.4843 0.3882031.6187 25.95 56.2626 S6 −754.986 0.299696 S7 Fourth Lens 28.81250.280109 1.6776 19.25 −45.6424 S8 14.8574 0.686178 S9 Fifth Lens 10.19980.396608 1.5704 37.36 −46.2001 S10 7.24956 0.420097 S11 Sixth Lens2.85191 0.672962 1.5459 56.11 6.45568 S12 13.7016 0.708767 S13 SeventhLens −11.9845 0.603752 1.5459 56.11 −4.72501 S14 3.3455 0.339027 S15Filter Infinity 0.21 1.5183 64.20 S16 Infinity 0.462911 S17 ImagingPlane Infinity

A focal length f of the optical imaging system of the second example is6.21249 mm, f12 is 7.53789 mm, Fno is 1.88, FOV is 83°, IMG HT is 5.644mm, SD5 is 2.55 mm, SD6 is 3.85354 mm, and SD7 is 5.1063 mm.

The definitions of f12, Fno, FOV, IMG HT, SD5, SD6, and SD7 are the sameas in the first example.

In the second example, the first lens 210 may have a positive refractivepower, the first surface of the first lens 210 may be convex, and thesecond surface of the first lens 210 may be concave.

The second lens 220 may have a negative refractive power, the firstsurface of the second lens 220 may be convex, and the second surface ofthe second lens 220 may be concave.

The third lens 230 may have a positive refractive power, and the firstand second surfaces of the third lens 230 may be convex.

The fourth lens 240 may have a negative refractive power, the firstsurface of the fourth lens 240 may be convex, and the second surface ofthe fourth lens 240 may be concave.

The fifth lens 250 may have a negative refractive power, the firstsurface of the fifth lens 250 may be convex in a paraxial region, andthe second surface of the fifth lens 250 may be concave in a paraxialregion.

Also, at least one inflection point may be formed on at least one of thefirst and second surfaces of the fifth lens 250. For example, the firstsurface of the fifth lens 250 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. Further, the secondsurface of the fifth lens 250 may be concave in a paraxial region andmay be convex in portions other than a paraxial region.

The sixth lens 260 may have a positive refractive power, the firstsurface of the sixth lens 260 may be convex in a paraxial region, andthe second surface of the sixth lens 260 may be concave in a paraxialregion.

At least one inflection point may be formed on at least one of the firstand second surfaces of the sixth lens 260. For example, the firstsurface of the sixth lens 260 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. Also, the secondsurface of the sixth lens 260 may be concave in a paraxial region andmay be convex in portions other than a paraxial region.

The seventh lens 270 may have a negative refractive power, and the firstand second surfaces of the seventh lens 270 may be concave.

At least one inflection point may be formed on at least one of the firstand second surfaces of the seventh lens 270. For example, the firstsurface of the seventh lens 270 may be concave in a paraxial region andmay be convex in portions other than a paraxial region. Further, thesecond surface of the seventh lens 270 may be concave in a paraxialregion and may be convex in portions other than a paraxial region.

Each surface of the first lens 210 to the seventh lens 270 has theaspherical coefficients listed in Table 4 below. In this example, boththe first surface and the second surface of each of the first lens 210to the seventh lens 270 are aspherical.

TABLE 4 S1 S2 S3 S4 S5 S6 S7 Conic −0.925 21.109 16.894 3.315 −95.00095.000 57.741 Constant (K) Fourth −0.017 −0.039 −0.049 −0.017 0.021−0.016 −0.026 Coefficient (A) Sixth 0.169 0.081 0.083 0.018 −0.422−0.039 −0.340 Coefficient (B) Eighth −0.603 −0.223 −0.229 −0.050 3.0410.247 1.956 Coefficient (C) Tenth 1.381 0.570 0.735 0.365 −13.574 −0.860−6.857 Coefficient (D) Twelfth −2.137 −1.069 −1.752 −1.343 40.349 1.90316.065 Coefficient (E) Fourteenth 2.321 1.420 2.904 3.020 −83.357 −2.801−26.358 Coefficient (F) Sixteenth −1.811 −1.354 −3.406 −4.619 122.8102.740 31.048 Coefficient (G) Eighteenth 1.026 0.937 2.874 5.025 −130.759−1.699 −26.561 Coefficient (H) Twentieth −0.423 −0.472 −1.755 −3.940100.828 0.543 16.511 Coefficient (J) S8 S9 S10 S11 S12 S13 S14 Conic53.224 7.908 −95.000 −7.008 −8.997 −8.900 −19.481 Constant (K) Fourth−0.060 −0.076 −0.092 0.006 0.043 −0.041 −0.003 Coefficient (A) Sixth0.059 0.064 0.057 −0.021 −0.032 −0.008 −0.022 Coefficient (B) Eighth−0.208 −0.077 −0.058 0.016 0.013 0.013 0.014 Coefficient (C) Tenth 0.5870.110 0.072 −0.009 −0.002 −0.005 −0.005 Coefficient (D) Twelfth −1.160−0.136 −0.073 0.004 0.000 0.001 0.001 Coefficient (E) Fourteenth 1.5960.121 0.054 −0.001 0.000 0.000 0.000 Coefficient (F) Sixteenth −1.556−0.077 −0.028 0.000 0.000 0.000 0.000 Coefficient (G) Eighteenth 1.0910.035 0.011 0.000 0.000 0.000 0.000 Coefficient (H) Twentieth −0.552−0.011 −0.003 0.000 0.000 0.000 0.000 Coefficient (J)

The optical imaging system having the configuration described above hasthe aberration properties illustrated in FIG. 4.

FIG. 5 is a diagram illustrating a third example of an optical imagingsystem, and FIG. 6 is a diagram illustrating aberration properties ofthe optical imaging system illustrated in FIG. 5.

The optical imaging system of the third example may include an opticalsystem including a first lens 310, a second lens 320, a third lens 330,a fourth lens 340, a fifth lens 350, a sixth lens 360, and a seventhlens 370, and may further include a stop (not shown), a filter 380, andan image sensor 390.

Optical characteristics of each element (a radius of curvature of eachsurface of the element, a thickness of the element or a distance betweenthe element and a next element, a refractive index, an Abbe number, anda focal length) of the optical imaging system are listed in Table 5below.

TABLE 5 Surface Radius of Thickness or Refractive Abbe Focal No. ElementCurvature Distance Index Number Length S1 First Lens 2.3083 0.9262791.5459 56.11 5.36157 S2 9.37212 0.104074 S3 Second Lens 6.871 0.271.6776 19.25 −13.558 S4 3.86852 0.363672 S5 Third Lens 37.6246 0.3452391.6187 25.95 44.1579 S6 −99.401 0.280264 S7 Fourth Lens 37.8645 0.281.6776 19.25 −40.5801 S8 15.8814 0.730272 S9 Fifth Lens 10.8498 0.4189651.5704 37.36 −27.2736 S10 6.30204 0.390733 S11 Sixth Lens 2.757530.826713 1.5459 56.11 5.8263 S12 18.53 0.760994 S13 Seventh Lens−14.6467 0.49 1.5459 56.11 −4.70273 S14 3.14982 0.339027 S15 FilterInfinity 0.21 1.5183 64.20 S16 Infinity 0.463769 S17 Imaging PlaneInfinity

A focal length f of the optical imaging system of the third example is6.15697 mm, f12 is 7.69842 mm, Fno is 1.87, FOV is 83°, IMG HT is 5.644mm, SD5 is 2.755 mm, SD6 is 4 mm, and SD7 is 5.14779 mm.

The definitions of f12, Fno, FOV, IMG HT, SD5, SD6, and SD7 are the sameas in the first example.

In the third example, the first lens 310 may have a positive refractivepower, the first surface of the first lens 310 may be convex, and thesecond surface of the first lens 310 may be concave.

The second lens 320 may have a negative refractive power, the firstsurface of the second lens 320 may be convex, and the second surface ofthe second lens 320 may be concave.

The third lens 330 may have a positive refractive power, and the firstand second surfaces of the third lens 330 may be convex.

The fourth lens 340 may have a negative refractive power, the firstsurface of the fourth lens 340 may be convex, and the second surface ofthe fourth lens 340 may be concave.

The fifth lens 350 may have a negative refractive power, the firstsurface of the fifth lens 350 may be convex in a paraxial region, andthe second surface of the fifth lens 350 may be concave in a paraxialregion.

Also, at least one inflection point may be formed on at least one of thefirst and second surfaces of the fifth lens 350. For example, the firstsurface of the fifth lens 350 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. The second surfaceof the fifth lens 350 may be concave in a paraxial region and may beconvex in portions other than a paraxial region.

The sixth lens 360 may have a positive refractive power, the firstsurface of the sixth lens 360 may be convex in a paraxial region, andthe second surface of the sixth lens 360 may be concave in a paraxialregion.

At least one inflection point may be formed on at least one of the firstand second surfaces of the sixth lens 360. For example, the firstsurface of the sixth lens 360 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. The second surfaceof the sixth lens 360 may be concave in a paraxial region and may beconvex in portions other than a paraxial region.

The seventh lens 370 may have a negative refractive power, and the firstand second surfaces of the seventh lens 370 may be concave.

At least one inflection point may be formed on at least one of the firstand second surfaces of the seventh lens 370. For example, the firstsurface of the seventh lens 370 may be concave in a paraxial region andmay be convex in portions other than a paraxial region. The secondsurface of the seventh lens 370 may be concave in a paraxial region andmay be convex in portions other than a paraxial region.

Each surface of the first lens 310 to the seventh lens 370 has theaspherical coefficients listed in Table 6 below. In this example, boththe first surface and the second surface of each of the first lens 310to the seventh lens 370 are aspherical.

TABLE 6 S1 S2 S3 S4 S5 S6 S7 Conic −0.938 21.744 16.968 3.300 −88.88095.000 −95.000 Constant (K) Fourth −0.015 −0.029 −0.072 0.008 0.040−0.034 −0.013 Coefficient (A) Sixth 0.157 0.061 0.357 −0.419 −0.6800.155 −0.507 Coefficient (B) Eighth −0.568 −0.192 −1.859 3.365 4.790−1.002 2.983 Coefficient (C) Tenth 1.317 0.509 6.711 −15.787 −20.9854.132 −10.801 Coefficient (D) Twelfth −2.062 −0.947 −16.452 49.04061.511 −11.323 26.089 Coefficient (E) Fourteenth 2.263 1.236 28.249−105.827 −125.867 21.469 −43.941 Coefficient (F) Sixteenth −1.781 −1.155−34.785 162.932 184.370 −28.957 52.909 Coefficient (G) Eighteenth 1.0170.783 31.099 −181.383 −195.763 28.193 −46.094 Coefficient (H) Twentieth−0.421 −0.387 −20.216 146.308 150.894 −19.879 29.079 Coefficient (J) S8S9 S10 S11 S12 S13 S14 Conic 61.516 11.931 −82.269 −6.838 −2.326 −4.191−15.830 Constant (K) Fourth −0.064 −0.055 −0.070 0.003 0.041 −0.046−0.010 Coefficient (A) Sixth 0.083 0.013 0.019 −0.016 −0.029 −0.004−0.018 Coefficient (B) Eighth −0.302 0.041 0.003 0.012 0.011 0.009 0.012Coefficient (C) Tenth 0.778 −0.080 0.000 −0.006 −0.002 −0.003 −0.004Coefficient (D) Twelfth −1.391 0.081 −0.008 0.002 0.000 0.001 0.001Coefficient (E) Fourteenth 1.759 −0.055 0.009 −0.001 0.000 0.000 0.000Coefficient (F) Sixteenth −1.601 0.027 −0.005 0.000 0.000 0.000 0.000Coefficient (G) Eighteenth 1.060 −0.010 0.002 0.000 0.000 0.000 0.000Coefficient (H) Twentieth −0.510 0.003 0.000 0.000 0.000 0.000 0.000Coefficient (J)

The optical imaging system having the configuration described above hasthe aberration properties illustrated in FIG. 6.

FIG. 7 is a diagram illustrating a fourth example of an optical imagingsystem, and FIG. 8 is a diagram illustrating aberration properties ofthe optical imaging system illustrated in FIG. 7.

The optical imaging system of the fourth example may include an opticalsystem including a first lens 410, a second lens 420, a third lens 430,a fourth lens 440, a fifth lens 450, a sixth lens 460, and a seventhlens 470, and may further include a stop (not shown), a filter 480, andan image sensor 490.

Optical characteristics of each element (a radius of curvature of eachsurface of the element, a thickness of the element or a distance betweenthe element and a next element, a refractive index, an Abbe number, anda focal length) of the optical imaging system are listed in Table 7below.

TABLE 7 Surface Radius of Thickness or Refractive Abbe Focal No. ElementCurvature Distance Index Number Length S1 First Lens 2.31998 0.9672151.5459 56.11 5.42497 S2 9.1314 0.0696496 S3 Second Lens 6.81342 0.31.6776 19.25 −13.2649 S4 3.80661 0.350527 S5 Third Lens 61.427 0.3936321.6187 25.95 40.8995 S6 −42.9241 0.298373 S7 Fourth Lens 45.9659 0.31.6776 19.25 −47.278 S8 18.8282 0.616003 S9 Fifth Lens 12.2025 0.4499591.5704 37.36 −21.592 S10 6.04715 0.324875 S11 Sixth Lens 2.6353 0.7772721.5459 56.11 5.39462 S12 22.4437 0.752502 S13 Seventh Lens −25.4299 0.51.5361 55.66 −4.69038 S14 2.80931 0.339027 S15 Filter Infinity 0.211.5183 64.20 S16 Infinity 0.550965 S17 Imaging Plane Infinity

A focal length f of the optical imaging system of the third example is6.11088 mm, f12 is 7.88144 mm, Fno is 1.88, FOV is 84°, IMG HT is 5.644mm, SD5 is 3.195 mm, SD6 is 4.10057 mm, and SD7 is 4.92962 mm.

The definitions of f12, Fno, FOV, IMG HT, SD5, SD6, and SD7 are the sameas in the first example.

In the fourth example, the first lens 410 may have a positive refractivepower, the first surface of the first lens 410 may be convex, and thesecond surface of the first lens 410 may be concave.

The second lens 420 may have a negative refractive power, the firstsurface of the second lens 420 may be convex, and the second surface ofthe second lens 420 may be concave.

The third lens 430 may have a positive refractive power, and the firstand second surfaces of the third lens 430 may be convex.

The fourth lens 440 may have a negative refractive power, the firstsurface of the fourth lens 440 may be convex, and the second surface ofthe fourth lens 440 may be concave.

The fifth lens 450 may have a negative refractive power, the firstsurface of the fifth lens 450 may be convex in a paraxial region, andthe second surface of the fifth lens 450 may be concave in a paraxialregion.

Also, at least one inflection point may be formed on at least one of thefirst and second surfaces of the fifth lens 450. For example, the firstsurface of the fifth lens 450 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. Further, the secondsurface of the fifth lens 450 may be concave in a paraxial region andmay be convex in portions other than a paraxial region.

The sixth lens 460 may have a positive refractive power, the firstsurface of the sixth lens 460 may be convex in a paraxial region, andthe second surface of the sixth lens 460 may be concave in a paraxialregion.

At least one inflection point may be formed on at least one of the firstand second surfaces of the sixth lens 460. For example, the firstsurface of the sixth lens 460 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. The second surfaceof the sixth lens 460 may be concave in a paraxial region and may beconvex in portions other than a paraxial region.

The seventh lens 470 may have a negative refractive power, and the firstand second surfaces of the seventh lens 470 may be concave.

At least one inflection point may be formed on at least one of the firstand second surfaces of the seventh lens 470. For example, the firstsurface of the seventh lens 470 may be concave in a paraxial region andmay be convex in portions other than a paraxial region. The secondsurface of the seventh lens 470 may be concave in a paraxial region andmay be convex in portions other than a paraxial region.

Each surface of the first lens 410 to the seventh lens 470 has theaspherical coefficients listed in Table 8 below. In this example, boththe first surface and the second surface of each of the first lens 410to the seventh lens 470 are aspherical.

TABLE 8 S1 S2 S3 S4 S5 S6 S7 Conic −0.868 21.060 17.042 3.395 −94.609−37.791 88.203 Constant (K) Fourth 0.035 −0.005 −0.029 −0.027 −0.0320.001 −0.096 Coefficient (A) Sixth −0.191 −0.195 −0.061 0.180 0.356−0.183 0.372 Coefficient (B) Eighth 0.793 1.056 0.414 −1.398 −3.3010.908 −1.951 Coefficient (C) Tenth −2.061 −3.215 −1.194 7.159 18.100−2.878 6.419 Coefficient (D) Twelfth 3.612 6.470 2.246 −23.970 −64.5836.108 −14.255 Coefficient (E) Fourteenth −4.449 −9.065 −2.997 55.132157.989 −8.931 22.265 Coefficient (F) Sixteenth 3.944 9.071 2.967−89.942 −273.030 9.054 −25.088 Coefficient (G) Eighteenth −2.546 −6.562−2.253 105.829 338.436 −6.259 20.664 Coefficient (H) Twentieth 1.1973.434 1.338 −90.164 −301.875 2.774 −12.467 Coefficient (J) S8 S9 S10 S11S12 S13 S14 Conic 91.880 12.735 −90.690 −6.353 19.379 −6.859 −13.357Constant (K) Fourth −0.051 −0.046 −0.055 −0.003 0.036 −0.088 −0.042Coefficient (A) Sixth 0.031 0.029 −0.004 −0.010 −0.020 0.032 0.009Coefficient (B) Eighth −0.110 −0.009 0.038 0.006 0.004 −0.008 0.000Coefficient (C) Tenth 0.262 −0.002 −0.039 −0.002 0.001 0.002 −0.001Coefficient (D) Twelfth −0.426 0.003 0.024 0.001 −0.001 −0.001 0.000Coefficient (E) Fourteenth 0.488 −0.001 −0.010 0.000 0.000 0.000 0.000Coefficient (F) Sixteenth −0.401 0.000 0.003 0.000 0.000 0.000 0.000Coefficient (G) Eighteenth 0.239 0.000 −0.001 0.000 0.000 0.000 0.000Coefficient (H) Twentieth −0.103 0.000 0.000 0.000 0.000 0.000 0.000Coefficient (J)

The optical imaging system having the configuration described above hasthe aberration properties illustrated in FIG. 8.

FIG. 9 is a diagram illustrating a fifth example of an optical imagingsystem, and FIG. 10 is a diagram illustrating aberration properties ofthe optical imaging system illustrated in FIG. 9.

The optical imaging system of the fifth example may include an opticalsystem including a first lens 510, a second lens 520, a third lens 530,a fourth lens 540, a fifth lens 550, a sixth lens 560, and a seventhlens 570, and may further include a stop (not shown), a filter 580, andan image sensor 590.

Optical characteristics of each element (a radius of curvature of eachsurface of the element, a thickness of the element or a distance betweenthe element and a next element, a refractive index, an Abbe number, anda focal length) of the optical imaging system are listed in Table 9below.

TABLE 9 Surface Radius of Thickness or Refractive Abbe Focal No. ElementCurvature Distance Index Number Length S1 First Lens 2.33815 0.9745221.5459 56.11 5.49327 S2 9.04954 0.04 S3 Second Lens 6.73902 0.3 1.677619.25 −13.6736 S4 3.83116 0.414899 S5 Third Lens 26.9658 0.357568 1.570437.36 52.7862 S6 257.243 0.327213 S7 Fourth Lens 36.3661 0.319 1.677619.25 −48.7836 S8 17.2543 0.544789 S9 Fifth Lens 11.3895 0.483831 1.570437.36 −26.374 S10 6.38177 0.323176 S11 Sixth Lens 2.59335 0.7298151.5361 55.66 5.46785 S12 20.2977 0.814997 S13 Seventh Lens −25.5797 0.51.5361 55.66 −4.68196 S14 2.80181 0.339027 S15 Filter Infinity 0.211.5183 64.20 S16 Infinity 0.521157 S17 Imaging Plane Infinity

A focal length f of the optical imaging system of the fifth example is6.08291 mm, f12 is 7.93893 mm, Fno is 1.88, FOV is 84.3°, IMG HT is5.644 mm, SD5 is 3.3717 mm, SD6 is 4.02459 mm, and SD7 is 5.05356 mm.

The definitions of f12, Fno, FOV, IMG HT, SD5, SD6, and SD7 are the sameas in the first example.

In the fifth example, the first lens 510 may have a positive refractivepower, the first surface of the first lens 510 may be convex, and thesecond surface of the first lens 510 may be concave.

The second lens 520 may have a negative refractive power, the firstsurface of the second lens 520 may be convex, and the second surface ofthe second lens 520 may be concave.

The third lens 530 may have a positive refractive power, the firstsurface of the third lens 530 may be convex, and the second surface ofthe third lens 530 may be concave.

The fourth lens 540 may have a negative refractive power, the firstsurface of the fourth lens 540 may be convex, and the second surface ofthe fourth lens 540 may be concave.

The fifth lens 550 may have a negative refractive power, the firstsurface of the fifth lens 550 may be convex in a paraxial region, andthe second surface of the fifth lens 550 may be concave in a paraxialregion.

Also, at least one inflection point may be formed on at least one of thefirst and second surfaces of the fifth lens 550. For example, the firstsurface of the fifth lens 550 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. The second surfaceof the fifth lens 550 may be concave in a paraxial region and may beconvex in portions other than a paraxial region.

The sixth lens 560 may have a positive refractive power, the firstsurface of the sixth lens 560 may be convex in a paraxial region, andthe second surface of the sixth lens 560 may be concave in a paraxialregion.

At least one inflection point may be formed on at least one of the firstand second surfaces of the sixth lens 560. For example, the firstsurface of the sixth lens 560 may be convex in a paraxial region and maybe concave in portions other than a paraxial region. The second surfaceof the sixth lens 560 may be concave in a paraxial region and may beconvex in portions other than a paraxial region.

The seventh lens 570 may have a negative refractive power, and the firstand second surfaces of the seventh lens 570 may be concave.

At least one inflection point may be formed on at least one of the firstand second surfaces of the seventh lens 570. For example, the firstsurface of the seventh lens 570 may be concave in a paraxial region andmay be convex in portions other than a paraxial region. Further, thesecond surface of the seventh lens 570 may be concave in a paraxialregion and may be convex in portions other than a paraxial region.

Each surface of the first lens 510 to the seventh lens 570 has theaspherical coefficients listed in Table 10 below. In this example, boththe first surface and the second surface of each of the first lens 510to the seventh lens 570 are aspherical.

TABLE 10 S1 S2 S3 S4 S5 S6 S7 Conic −0.898 21.147 16.981 3.368 79.14595.000 −17.302 Constant (K) Fourth 0.013 −0.030 −0.027 −0.039 −0.048−0.014 −0.085 Coefficient (A) Sixth −0.034 0.025 −0.051 0.342 0.428−0.045 0.355 Coefficient (B) Eighth 0.174 0.028 0.419 −2.249 −2.9870.311 −1.930 Coefficient (C) Tenth −0.537 −0.113 −1.270 9.731 13.156−1.413 6.553 Coefficient (D) Twelfth 1.107 0.059 2.139 −28.602 −39.1894.194 −14.950 Coefficient (E) Fourteenth −1.580 0.352 −1.733 59.10282.057 −8.429 23.869 Coefficient (F) Sixteenth 1.600 −0.983 −0.509−87.714 −123.531 11.802 −27.351 Coefficient (G) Eighteenth −1.163 1.3273.023 94.476 135.129 −11.717 22.785 Coefficient (H) Twentieth 0.607−1.117 −3.757 −73.872 −107.407 8.296 −13.825 Coefficient (J) S8 S9 S10S11 S12 S13 S14 Conic 44.471 9.592 −69.231 −5.764 21.077 −30.344 −12.145Constant (K) Fourth −0.043 −0.051 −0.077 −0.002 0.048 −0.074 −0.037Coefficient (A) Sixth 0.000 0.038 0.032 −0.005 −0.020 0.027 0.008Coefficient (B) Eighth 0.012 −0.021 −0.008 −0.003 −0.002 −0.009 −0.001Coefficient (C) Tenth −0.023 0.008 0.001 0.004 0.005 0.003 0.000Coefficient (D) Twelfth 0.003 −0.002 0.000 −0.002 −0.003 −0.001 0.000Coefficient (E) Fourteenth 0.046 0.000 0.000 0.001 0.001 0.000 0.000Coefficient (F) Sixteenth −0.080 0.000 0.000 0.000 0.000 0.000 0.000Coefficient (G) Eighteenth 0.073 0.000 0.000 0.000 0.000 0.000 0.000Coefficient (H) Twentieth −0.042 0.000 0.000 0.000 0.000 0.000 0.000Coefficient (J)

The optical imaging system having the configuration described above hasthe aberration properties illustrated in FIG. 10.

Table 11 below lists the values of Conditional Expressions 1 to 25 ofthe optical imaging system for each of the first to fifth examples.

TABLE 11 First Second Third Fourth Fifth Conditional Exam- Exam- Exam-Exam- Exam- Expression ple ple ple ple ple 0 < f1/f < 2 0.920 0.8520.871 0.888 0.903 25 < v1 − v2 < 45 36.723 36.868 36.868 36.868 36.86815 < v1 − v3 < 45 18.604 30.160 30.160 30.160 18.757 25 < v1 − v4 < 4536.723 36.868 36.868 36.868 36.868 15 < v1 − v5 < 45 18.604 18.75718.757 18.757 18.757 −3.5 < f2/f < 0 −2.516 −2.178 −2.202 −2.171 −2.248f3/f > 1.5 7.849 9.056 7.172 6.693 8.678 −9 < f4/f < 0 −5.614 −7.347−6.591 −7.737 −8.020 −30 < f5/f < 20 −10.120 −7.437 −4.430 −3.533 −4.3360 < f6/f < 2 1.024 1.039 0.946 0.883 0.899 −2 < f7/f < 0 −0.802 −0.761−0.764 −0.768 −0.770 TTL/f < 1.4 1.218 1.159 1.169 1.178 1.184 −1 <f1/f2 < 0 −0.366 −0.391 −0.395 −0.409 −0.402 −2 < f2/f3 < 0 −0.321−0.240 −0.307 −0.324 −0.259 BFL/f < 0.4 0.192 0.163 0.164 0.180 0.176D1/f < 0.3 0.008 0.010 0.017 0.011 0.007 0.4 < SD5/IMG 0.476 0.452 0.4880.566 0.597 HT < 0.7 0.6 < SD6/IMG 0.722 0.683 0.709 0.727 0.713 HT <0.8 0.7 < SD7/IMG 0.835 0.905 0.912 0.873 0.895 HT < 1 0 < f2/f7 < 53.137 2.863 2.883 2.828 2.920 −5 < f2/f6 < 0 −2.458 −2.096 −2.327 −2.459−2.501 74° < FOV < 90° 83° 83° 83° 84° 84.3° Fno < 2.0 1.75 1.88 1.871.88 1.88 TTL/(2*IMG HT) ≤ 0.664 0.638 0.638 0.638 0.638 0.67 1 < f12/f< 2 1.281 1.213 1.25 1.29 1.305

According to the examples described above, the optical imaging systemhas a high resolution and a reduced size.

While this disclosure includes specific examples, it will be apparentafter an understanding of the disclosure of this application thatvarious changes in form and details may be made in these exampleswithout departing from the spirit and scope of the claims and theirequivalents. The examples described herein are to be considered in adescriptive sense only, and not for purposes of limitation. Descriptionsof features or aspects in each example are to be considered as beingapplicable to similar features or aspects in other examples. Suitableresults may be achieved if the described techniques are performed tohave a different order, and/or if components in a described system,architecture, device, or circuit are combined in a different manner,and/or replaced or supplemented by other components or theirequivalents. Therefore, the scope of the disclosure is defined not bythe detailed description, but by the claims and their equivalents, andall variations within the scope of the claims and their equivalents areto be construed as being included in the disclosure.

What is claimed is:
 1. An optical imaging system comprising: a firstlens, a second lens, a third lens, a fourth lens, a fifth lens, a sixthlens, and a seventh lens sequentially disposed in ascending numericalorder along an optical axis from an object side of the optical imagingsystem toward an imaging plane of an image sensor, wherein TTL/(2*IMGHT)≤0.67 is satisfied, where TTL is a distance along the optical axisfrom an object-side surface of the first lens to the imaging plane ofthe image sensor, and IMG HT is one half of a diagonal length of theimaging plane of the image sensor, and 15<v1-v3<45 is satisfied, wherev1 is an Abbe number of the first lens, and v3 is an Abbe number of thethird lens.
 2. The optical imaging system of claim 1, wherein any one orany combination of any two or more of 25<v1-v2<45, 25<v1-v4<45, and15<v1-v5<45 is satisfied, where v2 is an Abbe number of the second lens,v4 is an Abbe number of the fourth lens, and v5 is an Abbe number of thefifth lens.
 3. The optical imaging system of claim 1, wherein Fno<2.0 issatisfied, where Fno is an f-number of the optical imaging system. 4.The optical imaging system of claim 1, wherein 0<f1/f<2 is satisfied,where f1 is a focal length of the first lens, and f is a focal length ofthe optical imaging system.
 5. The optical imaging system of claim 1,wherein −3.5<f2/f<0 is satisfied, where f2 is a focal length of thesecond lens, and f is a focal length of the optical imaging system. 6.The optical imaging system of claim 1, wherein f3/f>1.5 is satisfied,where f3 is a focal length of the third lens, and f is a focal length ofthe optical imaging system.
 7. The optical imaging system of claim 1,wherein −9<f4/f<0 is satisfied, where f4 is a focal length of the fourthlens, and f is a focal length of the optical imaging system.
 8. Theoptical imaging system of claim 1, wherein −30<f5/f<20 is satisfied,where f5 is a focal length of the fifth lens, and f is a focal length ofthe optical imaging system.
 9. The optical imaging system of claim 1,wherein TTL/f<1.4 is satisfied, where f is a focal length of the opticalimaging system, and BFL/f<0.4 is satisfied, where BFL is a distancealong the optical axis from an image-side surface of the seventh lens tothe imaging plane of the image sensor.
 10. The optical imaging system ofclaim 1, wherein −1<f1/f2<0 is satisfied, where f1 is a focal length ofthe first lens, and f2 is a focal length of the second lens.
 11. Theoptical imaging system of claim 1, wherein −2<f2/f3<0 is satisfied,where f2 is a focal length of the second lens, and f3 is a focal lengthof the third lens.
 12. The optical imaging system of claim 1, whereinD1/f<0.3 is satisfied, where D1 is a distance along the optical axisfrom an image-side surface of the first lens to an object-side surfaceof the second lens, and f is a focal length of the optical imagingsystem.
 13. The optical imaging system of claim 1, wherein 0.4<SD5/IMGHT<0.7 is satisfied, where SD5 is an effective aperture radius of animage-side surface of the fifth lens.
 14. The optical imaging system ofclaim 1, wherein 0.6<SD6/IMG HT<0.8 is satisfied, where SD6 is aneffective aperture radius of an image-side surface of the sixth lens.15. The optical imaging system of claim 1, wherein 0.7<SD7/IMG HT<1 issatisfied, where SD7 is an effective aperture radius of an image-sidesurface of the seventh lens.
 16. The optical imaging system of claim 1,wherein −5<f2/f6<0 is satisfied, where f2 is a focal length of thesecond lens, and f6 is a focal length of the sixth lens.
 17. The opticalimaging system of claim 1, wherein 0<f2/f7<5 is satisfied, where f2 is afocal length of the second lens, and f7 is a focal length of the seventhlens.
 18. The optical imaging system of claim 1, wherein 0<f6/f<2 issatisfied, where f6 is a focal length of the sixth lens, and f is afocal length of the optical imaging system.
 19. The optical imagingsystem of claim 1, wherein −2<f7/f<0 is satisfied, where f7 is a focallength of the seventh lens, and f is a focal length of the opticalimaging system.
 20. The optical imaging system of claim 1, wherein74°<FOV<90° is satisfied, where FOV is a field of view of the opticalimaging system.
 21. The optical imaging system of claim 1, wherein1<f12/f<2 is satisfied, where f12 is a combined focal length of thefirst lens and the second lens, and f is a focal length of the opticalimaging system.
 22. The optical imaging system of claim 1, wherein thefirst lens has a positive refractive power, the second lens has anegative refractive power, the third lens has a positive refractivepower, the fourth lens has a negative refractive power, the fifth lenshas a negative refractive power, the sixth lens has a positiverefractive power, and the seventh lens has a negative refractive power.23. An optical imaging system comprising: a first lens, a second lens, athird lens, a fourth lens, a fifth lens, a sixth lens, and a seventhlens sequentially disposed in ascending numerical order along an opticalaxis from an object side of the optical imaging system toward an imagingplane of an image sensor, wherein 15<v1-v3<45 is satisfied, where v1 isan Abbe number of the first lens, and v3 is an Abbe number of the thirdlens.
 24. The optical imaging system of claim 23, wherein all of25<v1-v2<45, 25<v1-v4<45, and 15<v1-v5<45 are satisfied, where v2 is anAbbe number of the second lens, v4 is an Abbe number of the fourth lens,and v5 is an Abbe number of the fifth lens.
 25. The optical imagingsystem of claim 23, wherein the first lens has a positive refractivepower, the second lens has a negative refractive power, the third lenshas a positive refractive power, the fourth lens has a negativerefractive power, the fifth lens has a negative refractive power, thesixth lens has a positive refractive power, and the seventh lens has anegative refractive power.
 26. The optical imaging system of claim 23,wherein the first lens has a convex object-side surface and a concaveimage-side surface, the second lens has a convex object-side surface anda concave image-side surface, the fourth lens has a convex object-sidesurface and a concave image-side surface, the fifth lens has a convexobject-side surface and a concave image-side surface, the sixth lens hasa convex object-side surface and a concave image-side surface, and theseventh lens has a concave image-side surface.